diff --git a/x-pack/plugins/lens/public/heatmap_visualization/visualization.tsx b/x-pack/plugins/lens/public/heatmap_visualization/visualization.tsx
index 4032aa8102b02..02b74b16a3ecd 100644
--- a/x-pack/plugins/lens/public/heatmap_visualization/visualization.tsx
+++ b/x-pack/plugins/lens/public/heatmap_visualization/visualization.tsx
@@ -337,7 +337,7 @@ export const getHeatmapVisualization = ({
                     function: HEATMAP_GRID_FUNCTION,
                     arguments: {
                       // grid
-                      strokeWidth: [0],
+                      strokeWidth: [1],
                       // cells
                       isCellLabelVisible: [false],
                       // Y-axis